Santhosh Nethaji, As outlined in the rejection response, we recommend resubmitting your application, ensuring that you include a valid URL that provides evidence of customer consent to receive messages.
Please refer to this Azure doc: SMS FAQ.
It could be a screenshot or a mock-up of the webpage or app where customers have granted permission.
If the above steps do not resolve the issue, we request you to submitting a support ticket for a immediate and focused assistance on this.